Gaps and Islands

Consecutive sequences break most candidates; the trick is a two-window difference

Consecutive sequences break most candidates; the trick is a two-window difference

Category

SQL

Difficulty

advanced

Duration

25 minutes

Challenges

0 hands-on challenges

Topics covered: Spotting Consecutive Sequences in the Question, The ROW_NUMBER Difference Trick, Date Gaps vs Integer Gaps, Island Aggregates: Length, Start, End, The LAG-Based Alternative and Sessionization Link

Lesson Sections

1. Spotting Consecutive Sequences in the Question

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2. The ROW_NUMBER Difference Trick

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3. Date Gaps vs Integer Gaps

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4. Island Aggregates: Length, Start, End

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5. The LAG-Based Alternative and Sessionization Link

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